I am not sure what the vb extension means, but my bro had a regular Asus P2B board. I tried to upgrade his celeron 300a to a coppermine, but it didn't work. The key to his was the board revision number. According to Asus, the P2B with hardware revision 1.12 or higher along with Bios 1011 will support coppermine. My bro's was 1.02 so it was a no go. Check the Asus page...there was a chart listing the boards and what cores they support.
"Water-Cooled CPU Runner"